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              h4 Experimenting with customizable, retina-pixel underlining.
    a href="https://squareup.com" a boring underline
    a.custom href="https://squareup.com" a fancy custom underline


h5 In context:
  | Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore
  a.custom href="https://squareup.com" magna aliqua
  | . Ut enim ad, minim veniam quis nostrud exercitation ullamco laboris nisi ut
    a.custom href="https://squareup.com" aliquip ex
  | ea commodo consequat. Duis aute irure dolor in
    a.custom href="https://squareup.com" reprehenderit
  | in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur
  a.custom href="https://squareup.com" sint occaecat
  | cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
              @import compass

$background-color: #fff !default
$link-color: #333 !default
$link-color-active: #55abad !default
$link-underline-color: $link-color !default
$link-underline-color-active: $link-color-active !default
$link-underline-width: 1px !default
$link-underline-offset: 2px !default
$breaking-underlines: true !default

=underline($color: $link-underline-color, $weight: $link-underline-width, $offset: $link-underline-offset)
  background-image: linear-gradient(bottom, transparent, transparent $offset, $color $offset, $color ($offset + $weight), transparent ($offset + $weight))

  font-size: 1.5em
  max-width: 40em
  margin: 0 auto
  padding: 1em

  color: $link-color
  +transition(color 200ms ease)
  &:hover, &:focus
    color: $link-color-active

  text-decoration: none
  position: relative
  @if $breaking-underlines
    text-shadow: -1px -1px 0 $background-color, 1px -1px 0 $background-color, -1px 1px 0 $background-color, 1px 1px 0 $background-color
  @media (-webkit-min-device-pixel-ratio: 1.5), (min-resolution: 144dpi)
    +underline($link-color, 0.5)
  &:hover, &:focus
    @media (-webkit-min-device-pixel-ratio: 1.5), (min-resolution: 144dpi)
      +underline($link-color-active, 0.5)
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